## Tag classes

qpx_TIFFTagPrefix | 0x74690000 | The high word of the tag ID contains the 'ti' characters. To test for a TIFF tag, use the boolean expression: ((tagID & 0xFFFF0000) = qpx_TIFFTagPrefix)
qpx_ExifTagPrefix | 0x65780000 | The high word of the tag ID contains the 'ex' characters. To test for an Exif tag, use the boolean expression: ((tagID & 0xFFFF0000) = qpx_ExifTagPrefix)
qpx_GPSTagPrefix | 0x67700000 | The high word of the tag ID contains the 'gp' characters. To test for a GPS tag, use the boolean expression: ((tagID & 0xFFFF0000) = qpx_GPSTagPrefix)
qpx_IPTCTagPrefix | 0x49500000 | The high word of the tag ID contains the 'IP' characters. To test for an IPTC tag, use the boolean expression: ((tagID & 0xFFFF0000) = qpx_IPTCTagPrefix)
qpx_QTTagPrefix | 0xA9000000 | The high byte of the tag ID contains the '©' character. To test for a QuickTime tag, use the boolean expression: ((tagID & 0xFF000000) = qpx_QTTagPrefix)

QPix © Escape
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